LLVM-EXTRACT(1)                      LLVM                      LLVM-EXTRACT(1)

NAME
       llvm-extract - extract a function from an LLVM module

SYNOPSIS
       llvm-extract [options] --func function-name [filename]

DESCRIPTION
       The llvm-extract command takes the name of a function and extracts it
       from the specified LLVM bitcode file.  It is primarily used as a
       debugging tool to reduce test cases from larger programs that are
       triggering a bug.

       In addition to extracting the bitcode of the specified function,
       llvm-extract will also remove unreachable global variables, prototypes,
       and unused types.

       The llvm-extract command reads its input from standard input if
       filename is omitted or if filename is -.  The output is always written
       to standard output, unless the -o option is specified (see below).

OPTIONS
       --alias alias-name
          Extract the alias named function-name from the LLVM bitcode.  May be
          specified multiple times to extract multiple alias at once.

       --ralias alias-regular-expr
          Extract the alias matching alias-regular-expr from the LLVM bitcode.
          All alias matching the regular expression will be extracted.  May be
          specified multiple times.

       --bb basic-block-specifier
          Extract basic blocks(s) specified in basic-block-specifier. May be
          specified multiple times. Each <function:bb[;bb]> specifier pair
          will create a function. If multiple basic blocks are specified in
          one pair, the first block in the sequence should dominate the rest.

       --delete
          Delete specified Globals from Module.

       -f
          Enable binary output on terminals.  Normally, llvm-extract will
          refuse to write raw bitcode output if the output stream is a
          terminal.  With this option, llvm-extract will write raw bitcode
          regardless of the output device.

       --func function-name
          Extract the function named function-name from the LLVM bitcode.  May
          be specified multiple times to extract multiple functions at once.

       --rfunc function-regular-expr
          Extract the function(s) matching function-regular-expr from the LLVM
          bitcode.  All functions matching the regular expression will be
          extracted.  May be specified multiple times.

       --glob global-name
          Extract the global variable named global-name from the LLVM bitcode.
          May be specified multiple times to extract multiple global variables
          at once.

       --rglob glob-regular-expr
          Extract the global variable(s) matching global-regular-expr from the
          LLVM bitcode.  All global variables matching the regular expression
          will be extracted.  May be specified multiple times.

       --keep-const-init
          Preserve the values of constant globals.

       --recursive
          Recursively extract all called functions

       -help
          Print a summary of command line options.

       -o filename
          Specify the output filename.  If filename is "-" (the default), then
          llvm-extract sends its output to standard output.

       -S
          Write output in LLVM intermediate language (instead of bitcode).

EXIT STATUS
       If llvm-extract succeeds, it will exit with 0.  Otherwise, if an error
       occurs, it will exit with a non-zero value.

SEE ALSO
       bugpoint(1)

AUTHOR
       Maintained by the LLVM Team (https://llvm.org/).

COPYRIGHT
       2003-2024, LLVM Project

17                                2024-05-01                   LLVM-EXTRACT(1)